Depth of field refers to the amount of the object that is in focus (the depth that is in focus). When you look through the camera's viewfinder on a close - up shot you may notice that part of the object is in focus and part is not. You can change the focus using the lens so that the front, middle or back zone of the object is in focus. You will, however, not normally be able to see the entire object in focus at the same time throughout the viewfinder.... (1999)Complete Story

Dermatitis is a group of skin conditions that may often be contracted by exposure to chemicals and metals. These may include scaling, splitting, eczema and so on. Dermatitis is a real hazard for jewelers. Metal workers suffer high rates of skin disorders.... (2002)Complete Story

Boy these people are really good at what they do. I’d love to watch them drawing sometime. Like their previous work ‘The Art of Jewelry Design’ this book belongs in your collection if you are interesting in drawing jewelry and need some basic design principles and information, especially about commercial conventions in design. It is without any doubt the best illustrated reference available for methods of rendering commercial jewelry and particularly gemstones. The designs are really heavy on the gemstones and the authors truly know their subject. This book also has what seems like more rendered metal surfaces and chains than the previous volume. It is really unsurpassed for its examples of rendered gemstones and stones in settings. Designing suggestions and conventions are discussed in the text.... (1996)Complete Story

Dust is small particles of a material. There are dusts you can see in the air; these can be breathed in, and because the particles are fairly large, they end up in the upper portions of the lungs. Some can be cleared from the body by its natural mucus where it is bound up, and brought up into the esophagus. From there it is swallowed and so exposes the stomach tissue to whatever chemical was ingested. Jewelry polishers may have elevated rates of stomach cancer as a result of this. With dust in the air, however, it is the smaller, invisible particles that are the most dangerous, and these stay in your lungs.... (2002)Complete Story

The "General Safety Rules for Tools" article applies here too, as with all power tools. Read the instruction manuals and directions most carefully. Plating and stripping solutions usually contain cyanides, bases or acids which, if mixed together, are used improperly or carelessly or come in contact with a cyanide plating solution can release hydrogen cyanide gas, which was used by the Nazis in the gas chambers and is still used in gas executions in the United States.... (1998)Complete Story